Screening machine



Sept .4, 1923.

J. C` SCREENING MACHINE# Filed July 5, 1922" 2 sheets-sheet 2 Patented Sept. 4, i923.

UNI'E@ SIIS JOHN C. DUNTON', OF GRI-LNB RAPIDS, MICHIGAN.

SCREENING MACHINE.

Application. filed July 3,

To all u1/om t may concern.'

yBe it known that I, Jui-IN C. DUNToN, a citizen of the United States, residing at Grand Rapids, in the county of Kent and State of Michigan, have invented certain new and useful'Improvements Machines, of which ication.

My invention relates to improvements in machines for screening stone, cinders, nuts, p mixed sizes where it is desired to assort the several sizes from each other, and its objects are: first, to provide a means whereby ythe several sizes of the material being screened may be assorted at one, continuous, operation; second, to provide a. means whereby said first object may be attained with a minimum of power requirements; third, to provide a means whereby it will be impossible to choke the machine with which the screening is being done, thus avoiding the necessity of stopping the machine to clean out the screening elements; fourth, to provide a means whereby the greatest amount of etliciency may be attained lviththe least possible amount of wear upon the screening elements, and, fifth, to provide a means whereby the wearing ing elements may be greatly increased without extra cost or trouble to the operator.

I attain these objects by the mechanism illustrated in the accompanying drawing, in which Fig. l is a sectional elevation of my screen looking to the left :from the line l-l of Fig. 3. is an elevation of the mathe following is a speci- I* ig. 2 chine showing how vator belt and the several actuating ychains are applied. Fig. 3 is a sectional elevation of the machine looking to the left from the line 3-3 of Fig. 2. Fig. 4 is au elevation of the screening reel upon an enlarged scale. Fig. 5 is an end elevation of the same with .one end plate removed to disclose the positions of the screening arms. Fig is a perspective of the reel showing' the preferred form of hub upon which the reel arms are to be mounted. Fig. 7 shows themannei' of securing the reel arms into the supporting bars on the hub.

Similar reference characters indicate similar parts throughout the several views.

In the accompanying' drawing I' have shown my machine as in the form of ianupright, rectangular enclosing case which I prefer to have made of metal, or to be kmetal in Screening gravel`I coal, crushed, and other articles of qualities of the screeny the line of descending material the driving belt, the elei `acting `upon the sprocket wheels 18.y

`'1922. sei-iai No. 572,387.

lined, so /the ini-lowing gravel, or otherxmaterial being operatedxupon, will not be likely to cut into-the surface of the case, and rouglieii it, when passing through the machine. v hopper, formed by the proper construction of the slides 2 and at, is

built into the upper end of the case l, and

that the material, upon being deposited into the machine, as at A," A

will pass through the lower opening of the hopper just back of the reel hubs S, and will land near the inner end of the reel arms 6, as at a in Fig. l. The reels are made to revolve in the direction indicated by the arrows, in Fig. l, so that ywhen the reel arms are passing from the position indicated-at a into the position indicated at b, the gravel, etc., will be made to slide upon the arms from the end of the arms. towards the hub of the reel, and 'then downwardly upon the preceding set of arms, as at c, and when these` arms have reached theline indicated at Z the material, as gravel,v etc., will be deposited upon, and will slide off ofthe chutes 10th the material at least three sittings with each revolution oi each reel, and any surplus that may iiotbe deposited upon the chutes 10 will be carried backwardly by the armsv indicated at e, over the slides or chutes f' into shown, at B, C, Orl), as the case may be, until the fine sand or dust islinally taken up 7 and passed out yofthe machine.

I prefer that the chutes l0 be so arranged that th l length ofthe upper chutes asto insure the deposit of eachV grade or size of material being screened in `apile by itself, thus insuring a perfect grading or asserting of the various sizes of material.`

The reels are mounted upon shafts, as 9, or 9, and are made to revolve lin the case, preferably, by means of sprocket chains v17 chains'l are kmade to revolve the shafts` 9 and 9 bylmeans ofany of the well known lines .of power transmission, acting us giving by the worinv as the belt '19 t upon the pulley 16 and causing the.

shaft 16 to revolve. In this instance I have shown a small gear wheel l5 mounted upon the end ot the shaft 16 and meshing with a larger gear wheel, l5, which is mounted upon the shaft E that carries the sprocket wheel 1 8 so that the shaft E is made to revolve much slower than the shaft 1G revolves. rlfhe shafts l6, lil, and I3 are mounted upon the girts 23 at the upper end of the case l and the shaft I3 is driven by means of the sprocket chain hl, Yfrom the sprocket wheel i8', for the purpose of carrying the belt ll, upon mounted, over the drum l2 for elevating gravel, etc. upwardly and into the hopper Yformed by the walls of the case l and the incline-d walls 2 and 4f.

At 5 I have shown a guard that is made in the case l back of the reels and is designed to hold the material being screened in such position that it cannot drop off of the ends of the reel arms, but such as cannot pass through between the arms must be carried over and discharged into the chutes l0. It will be noted, by reference to Fig. 3, that the arms on each lower reel are closer together than those on the reel immediately above it. This `is necessary for the proper grading or assorting ofthe several sizes of material being screened. e

In the construct-ion of the reel I prefer that the forni oi hub shown in Fig. 6 be used. In this construction 8 represents a east iron, malleable iron, or other suitable hub made Yto secure to the driving shaft, as 9, which said hub is made the entire length of the reel and is so cast upon the bars 20, which I prefer to have made of Swedish iron, properly prepared steel, soft wrought iron or othersuitahle material that may be readily prepared for the reception and proper support of the rcel arms 6. In preparing the bars 2O for the reception of the arms 6 I drill a. series of holes into theedges of said bars, which holes must be of a proper size and dept-li to receive and firmly 'hold the arms, and, to assure the firm holding of said arms I drill a hole adjacent to each arm, as indicated at 7L, and pass a. pin through each of said holes as indicated in Figs. 6 and 7. I aim to have this pin extend, one half of its diameter, into the side of the arm, so the arm cannot revolve or move endwise in its bearing, and it will be readily understood that if an arm is removed from one position, as at z', into position upon the opposite side of the hub, as at j, the wearing surface of the arm will be reversed so that I am enabled to, thus, double the wearing qualities of the arms.

I have provided for washing the material as it is passing throughthe machine in the process rof being screened, by means of a water jet, substantially as shown at 2l, one or more of which may be utilized, and placed which the elevator buckets ll arev integral, and the discs 6 covered in claim l,

Leccese in such positions in the case as may be desired, and to which water, under pressure, may be conducted through any desired formed or positioned stand pipe, or water supply pipe, as indicated at 22. It will, of course, be understood that these sprays may be located adjacent to any or all of the reels, and may be made to disperse the water in any desired direction.

6 represents a disc that I prefer to have placed at each end of the rcel adjacent to, or imbedded into the sides ofthe case, and F represents supporting plates or hubs thereon for strengthening; said discs. K

Inthe construction of the hub S, shown in Fig. 6, the flanges iF are cast integral with the hub and so the ends of the'bars 2O will extend slightly into said flanges, thus making the hub and the bars practically are firmlyy riveted to the flanges F, as indicated in Fig. 5. On account of the removal of the flange F from the end of the shaft 8 in Fig. 6 I have shown this end of the hub in section, which would follow with the removalof an integral part, yas the liange F. i

Having thus fully described my invention, what I claim as new in the art, is:

l. In a screening machine i'or grading the sizes of the elements in lump material, an enclosing case, a series of revoluble reels mounted in said case, said reels made up i4of' a central elongated hub having arms radiating therefrom, said reels positioned one above the other and each lower reel hav ing its arms spaced closer together than the next preceding upper reel, a discharge chute from each reel arranged to deposit each grade of material in a different locality from all other grades of said material, longitudinally of the reels, and ineans for revolv ing said reels uniformly for receiving, assorting and discharging the material being screened.

2. In combination with the elements covered in claim l, the elongated hubs ymade of cast material, wrought material bars positioned longitudinally of said cast hubs and radiating l having holes drilled therein for the reception of the radiating arms, and means for securing the arms firmly, but temporarily into said bars.

3. In combination with the elements the elongated hubs lmade of cast material, a flange cast integral with each end of said hub, wrought bars positioned longitudinally of said hub and made integral therewith and the ends of the hubs, holes formed in the edges of said bars 'for the reception and support of the radiating arms, and means for securing the arms rmly into saidbars.

l. In combination with the elements covered in claim l', a feeding hopper widthwise therefrom, said barsy with the flanges atI formed 13 in the upper end of the case, discharge chutes arranged to carry material from each reel as it is screened, means for elevating the material into the hopper uniformly with 5 the revolutions of the reels.

5. In combination with the elements covered in claim l, means mounted in the lower end of the case for removing the ner particles from the screen after the larger lumps have been assorted and dis- 10 charged.

A 6. In combination with the elements covered in claim l, means located Within the case in positions to sprayvvater upon the material being Wash the same Signed at Chicago, Illinois, June 30 1922.

JOHN C. DUNTON.

screened and thoroughlyv 15 

